Dovetail-countersinking machine



(No Model.)

v G. A. HUBEN. DOVETAIL OOUNTERSINKING MACHINE.

No. 599,655. I Patented Feb. 22, 1898.

v I A 3513 atto'cuu MMW UNITED STATES PATENT OFFICE.

GU'STAVUS A HUBEN, OF SPRINGFIELD, OHIO.

DOVE TAIL-COUNTE RSINKING MACHINE.

SPECIFICATION forming part of Letters Patent No. 599,655, dated February 22, 1898.

Application filed May 10, 1897. Serial No. 635,936. (No model.)

cially adapted for forming openings or recesses for anchor bolts or screws or thin metal plates such as are used for photo-engraving electrotypes, metal signs, and-similar work,

where it is desired to secure such plate to a block or support of different material.

My invention consists in the constructions and combinations of parts hereinafter described, and set forth in the claims.

In the drawings, Figure 1 is a side elevation, partly in section, of a device embodying my invention. Fig. 2 is a transverse sectional view of the operating-spindle, taken on the line 00 0c in Fig. 1. Fig. 3 is an end View of the cutter, Figs. 2 and 3 being made on alarger scale than the parts shown in Fig. 1.

Like parts are represented by similar letters of reference in the several views.

In the said drawings, a represents a frame, which may be of any suitable shape and size, preferably provided with bearings or bearingsupports a and a and with a table a There is mounted in the bearings or bearing-supports a and a a hollow spindle b, which has mounted thereon, preferably between the bearings a and a apulleyb, which is splined onto the spindle b, so that the spindle may move through the pulley, but revolve with the same. The bearing or bearing-support a is internally screw threaded, and there is screwed into the same a sleeve a provided at its upper end with a flange or hand-wheel a by which the sleeve may be turned so as to screw the same into or out of the bearing a. The hollow spindle b and the sleeve a are constructed with interengaging parts, so that the spindle may turn freely in the sleeve, but is prevented from longitudinal movement therein. This may be accomplished by forming the spindle b with a flange or collar b fitted into a corresponding recess in the sleeve, the end of said sleeve being closed by a perforated cap 19 which fits over the end of the spindle.

There is mounted in the hollow spindle at one end a cutting-tool c, which is slotted on its sides and near the bottom with any number of slots 0, two being shown in the drawings, and in these slots are pivoted cutters 0 These cutters or the cutting ends thereof normally stand within the outer periphery of the cutting-tool 0 which is provided on its end with cutting teeth or serrations, such as are well known in boring-cutters or rose-cutters. The pivoted cutters c are normally held within the outer periphery of the rose-cutters or mill 0- by springs 0 and within the spindle Z) there is mounted a movable stem 01, the lower end of which bears against the inner sides of the cutters 0 so that as the stem is moved longitudinally said cutters areforced outwardly. This stem 61 is preferably provided on the upper end with a suitable hand-wheel or flange d and is screw-threaded at d and screwed into the cap 19 so that by turning the hand-wheel d the stem may be moved longitudinally, so as to force the cutters c in or out from the rose-cutter or mill 0 .The operation of the device as thus far described is as follows: A plate such as shown at e is placed on the table a The spindle is set to revolving and is moved downwardly by turning the handwheel a until the cutter a engaging with the plate, forms an opening to the required depth therein. This is preferably determined by the shoulders on the hand-wheel a engaging with the top of the bearing a or by any other suitable interengaging parts such as are now common in the art. When this has been accomplished, the hand-wheel d is turned so as to move the stem (1 longitudinally and thus force the cutters c laterally. These cutters are so constructed that they engage the sides of the opening already formed, starting at the bottom first and forming a beveled or dovetailed side larger at the bottom than at the top.

To prevent the cutter from being withdrawn until the auxiliary or pivoted cutters c are moved within the outer periphery of the rosecutter or mill, I provide in the side of the hollow spindle b a small stud or pin f. This stud or pin f is preferably journaled loosely in an opening formed in the side of the hollow spindle and has a projection f, which extends inwardly through the walls of said spindle and is adapted to be engaged by a collar or cam projection d on the stem (1. A bifurcated springf engaging in a circumferential groove f in the stud f and secured in a suitable recess in the spindle b, serves to hold this stud normally flush with or within the outer periphery of the spindle. lVhen the spindle has been moved downwardly to the required distance, the inner edge of the stud will stand just beyond the outer edge of the bearing a As the stem (1 is moved 1011- gitudinally the projection d coming in contact therewith, will force the stud outwardly and cause it to engage in the outer end of the bearing a and thus prevent the spindle from being moved inwardly until the stem has first been withdrawn, thus withdrawing the cutters. This same device also prevents the cutters from being moved outwardly until the milling or boring tool has reached the proper depth.

It is obvious that the devices for moving the different parts longitudinally may be modified as desired and in accordance with the well-known practices in the art to which this tool relates. Instead of having the screwthreaded sleeve 1) the hollow spindle could be moved with a hand-lever or other well-known device. The table 06 also could be provided with suitable devices for adjusting the same to provide for forming openings of different depths or to accommodate material of different thicknesses. These devices have not been shown, as such constructions are well-known, and it is my intention to employ any such adjustments as may be found desirable in use with the constructions which are believed to be novel in my device, which are set forth in the claims.

Having thus described my invention, I claim- 1. I11 a tool, such as described, a milling or boring cutter having the cutting-faces on the bottom thereof, laterally-movable auxiliary cutters secured in said cutter and within lateral openings extending to the bottom of said main cutter, the cutting end of said auxiliary cutters being arranged substantially on a line with the bottom of said main cutter and adapted to be moved laterally therefrom, substantially as specified.

2. The combination with the longitudinallymovable and rotating spindle, a cutter mounted therein having the laterally-movable auxiliary cutters pivoted thereto with the cutting end of said auxiliary cutters below the pivotal point and extending substantially flush or in line with the bottom of said main cutter, and a movable stem in said spindle adapted by a longitudinal movement to force said auxiliary cutters laterally from said main cutter substantially in a line with the bottom of said main cutter, substantially as and for the purpose specified.

3. The combination with arotating spindle, a cutter carried thereby, and auxiliary cutters pivotally mounted in said rotating cutter, means for distending said cutter, and a holding device adapted to prevent the removal of said cutting-tool until the auxiliary cutters are released, substantially as specified.

t. The combination with the hollow longitudinally-movable revolving spindle, and a longitudinally-movable stem therein, a hearing or sleeve in which said spindle revolves, and a laterally-movable projection operated by said spindle and adapted to engage with said sleeve or bearing and hold the spindle against longitudinal movement until said stem is withdrawn, substantially as specified.

5. The combination with a rotating cutter or cutting-head having the laterally-movable cutters pivoted therein,a longitudinally-movable stem adapted to distend said cutters, and

means, substantially as described, for holding said cutters against longitudinal movement until said stem is withdrawn to release said auxiliary cutters, substantially as specified.

6. The combination with the rotating spindle, and means for moving the same longitudinally, a cutter head mounted on said spindle, auxiliary cutters in said cutter-head, alongitudinally-movable stem to operate said auxiliary cutters, a laterally-moving pro ection on said spindle operated by the stern, a spring for returning said projection to its normal position, and a bearing or sleeve for said spindle against which said projection is adapted to operate, substantially as specified.

7. The combination with the hollow rotating spindle, a cutter-head having pivoted cutters therein, a screw-threaded sleeve in which said spindle is rotatably mounted, hearings or bearing supports for said spindle and sleeve, a stem extending through said spindle and adapted to operate said cutters, said stem being screw-threaded into said sleeve, substantially as and for the purpose specified.

8. The combination with the laterally-movable cutters, a longitudinally-moving stem, a laterally-moving projection, a cam or collar on said stem, and a stationary part to engage said projection, substantially as specified.

In testimony whereof I have hereunto set my hand this 4th day of May, A. D. 1897.

GUSTAVUS A. HUBEN. -Witnesses:

CHAS. I. WELcH, G. M. GRIDLEY. 

